[PATCH 2/2] UBUNTU: SAUCE: vt -- allow grub to request automatic vt_handoff

[Stefan Bader]

Looks simple enough.

Acked-by: Stefan Bader <stefan.bader at canonical.com>

On 07/29/2010 05:36 PM, Andy Whitcroft wrote:
> Grub may be able to select a graphics mode and paint a splash screen
> for us.  If so it needs to be able to tell us it has done so.  Add
> support for detecting a new graphics mode selected bit in the
> screen_info passed over at boot.  Use this to automatically enable
> vt_handoff mode.
> 
> Signed-off-by: Andy Whitcroft <apw at canonical.com>
> ---
>  drivers/char/vt.c           |    6 ++++++
>  include/linux/screen_info.h |    1 +
>  2 files changed, 7 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/char/vt.c b/drivers/char/vt.c
> index 2c64292..09f5632 100644
> --- a/drivers/char/vt.c
> +++ b/drivers/char/vt.c
> @@ -2885,6 +2885,12 @@ static int __init con_init(void)
>  	struct vc_data *vc;
>  	unsigned int currcons = 0, i;
>  
> +	if (screen_info.flags & VIDEO_FLAGS_HANDOFF) {
> +		printk(KERN_INFO "vt handoff: grub requested handoff (vt#8)\n");
> +		if (vt_handoff == -1)
> +			vt_handoff = 8;
> +	}
> +
>  	acquire_console_sem();
>  
>  	if (conswitchp)
> diff --git a/include/linux/screen_info.h b/include/linux/screen_info.h
> index 899fbb4..e699dd4 100644
> --- a/include/linux/screen_info.h
> +++ b/include/linux/screen_info.h
> @@ -67,6 +67,7 @@ struct screen_info {
>  #define VIDEO_TYPE_EFI		0x70	/* EFI graphic mode		*/
>  
>  #define VIDEO_FLAGS_NOCURSOR	(1 << 0) /* The video mode has no cursor set */
> +#define VIDEO_FLAGS_HANDOFF	(1 << 1) /* Video buffer is alredy painted */
>  
>  #ifdef __KERNEL__
>  extern struct screen_info screen_info;